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the expression gfc of 8x is 24x2 and 48x3
The expression that represents the greatest common factor (gcf) of 105 and 126 is 3 x 7 but the greatest common factor of them is 21
I don't know what expressions you have to choose from, but the GCF of those numbers is 22.
You didn't include the expression below. Without that that, we'd only be guessing.
division ladder for 12,16,28 and the gcf of all them